diff options
Diffstat (limited to 'drivers/net/netdevsim/health.c')
| -rw-r--r-- | drivers/net/netdevsim/health.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c new file mode 100644 index 0000000000..eb04ed715d --- /dev/null +++ b/drivers/net/netdevsim/health.c @@ -0,0 +1,283 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */ + +#include <linux/debugfs.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/slab.h> + +#include "netdevsim.h" + +static int +nsim_dev_empty_reporter_dump(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, void *priv_ctx, + struct netlink_ext_ack *extack) +{ + return 0; +} + +static int +nsim_dev_empty_reporter_diagnose(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, + struct netlink_ext_ack *extack) +{ + return 0; +} + +static const +struct devlink_health_reporter_ops nsim_dev_empty_reporter_ops = { + .name = "empty", + .dump = nsim_dev_empty_reporter_dump, + .diagnose = nsim_dev_empty_reporter_diagnose, +}; + +struct nsim_dev_dummy_reporter_ctx { + char *break_msg; +}; + +static int +nsim_dev_dummy_reporter_recover(struct devlink_health_reporter *reporter, + void *priv_ctx, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx; + + if (health->fail_recover) { + /* For testing purposes, user set debugfs fail_recover + * value to true. Fail right away. + */ + NL_SET_ERR_MSG_MOD(extack, "User setup the recover to fail for testing purposes"); + return -EINVAL; + } + if (ctx) { + kfree(health->recovered_break_msg); + health->recovered_break_msg = kstrdup(ctx->break_msg, + GFP_KERNEL); + if (!health->recovered_break_msg) + return -ENOMEM; + } + return 0; +} + +static int nsim_dev_dummy_fmsg_put(struct devlink_fmsg *fmsg, u32 binary_len) +{ + char *binary; + int err; + int i; + + err = devlink_fmsg_bool_pair_put(fmsg, "test_bool", true); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, "test_u8", 1); + if (err) + return err; + err = devlink_fmsg_u32_pair_put(fmsg, "test_u32", 3); + if (err) + return err; + err = devlink_fmsg_u64_pair_put(fmsg, "test_u64", 4); + if (err) + return err; + err = devlink_fmsg_string_pair_put(fmsg, "test_string", "somestring"); + if (err) + return err; + + binary = kmalloc(binary_len, GFP_KERNEL | __GFP_NOWARN); + if (!binary) + return -ENOMEM; + get_random_bytes(binary, binary_len); + err = devlink_fmsg_binary_pair_put(fmsg, "test_binary", binary, binary_len); + kfree(binary); + if (err) + return err; + + err = devlink_fmsg_pair_nest_start(fmsg, "test_nest"); + if (err) + return err; + err = devlink_fmsg_obj_nest_start(fmsg); + if (err) + return err; + err = devlink_fmsg_bool_pair_put(fmsg, "nested_test_bool", false); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, "nested_test_u8", false); + if (err) + return err; + err = devlink_fmsg_obj_nest_end(fmsg); + if (err) + return err; + err = devlink_fmsg_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_u32_array"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_u32_put(fmsg, i); + if (err) + return err; + } + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_array_of_objects"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_obj_nest_start(fmsg); + if (err) + return err; + err = devlink_fmsg_bool_pair_put(fmsg, + "in_array_nested_test_bool", + false); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, + "in_array_nested_test_u8", + i); + if (err) + return err; + err = devlink_fmsg_obj_nest_end(fmsg); + if (err) + return err; + } + return devlink_fmsg_arr_pair_nest_end(fmsg); +} + +static int +nsim_dev_dummy_reporter_dump(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, void *priv_ctx, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx; + int err; + + if (ctx) { + err = devlink_fmsg_string_pair_put(fmsg, "break_message", + ctx->break_msg); + if (err) + return err; + } + return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len); +} + +static int +nsim_dev_dummy_reporter_diagnose(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + int err; + + if (health->recovered_break_msg) { + err = devlink_fmsg_string_pair_put(fmsg, + "recovered_break_message", + health->recovered_break_msg); + if (err) + return err; + } + return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len); +} + +static const +struct devlink_health_reporter_ops nsim_dev_dummy_reporter_ops = { + .name = "dummy", + .recover = nsim_dev_dummy_reporter_recover, + .dump = nsim_dev_dummy_reporter_dump, + .diagnose = nsim_dev_dummy_reporter_diagnose, +}; + +static ssize_t nsim_dev_health_break_write(struct file *file, + const char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev_health *health = file->private_data; + struct nsim_dev_dummy_reporter_ctx ctx; + char *break_msg; + int err; + + break_msg = memdup_user_nul(data, count); + if (IS_ERR(break_msg)) + return PTR_ERR(break_msg); + + if (break_msg[count - 1] == '\n') + break_msg[count - 1] = '\0'; + + ctx.break_msg = break_msg; + err = devlink_health_report(health->dummy_reporter, break_msg, &ctx); + if (err) + goto out; + +out: + kfree(break_msg); + return err ?: count; +} + +static const struct file_operations nsim_dev_health_break_fops = { + .open = simple_open, + .write = nsim_dev_health_break_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + +int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink) +{ + struct nsim_dev_health *health = &nsim_dev->health; + int err; + + health->empty_reporter = + devl_health_reporter_create(devlink, + &nsim_dev_empty_reporter_ops, + 0, health); + if (IS_ERR(health->empty_reporter)) + return PTR_ERR(health->empty_reporter); + + health->dummy_reporter = + devl_health_reporter_create(devlink, + &nsim_dev_dummy_reporter_ops, + 0, health); + if (IS_ERR(health->dummy_reporter)) { + err = PTR_ERR(health->dummy_reporter); + goto err_empty_reporter_destroy; + } + + health->ddir = debugfs_create_dir("health", nsim_dev->ddir); + if (IS_ERR(health->ddir)) { + err = PTR_ERR(health->ddir); + goto err_dummy_reporter_destroy; + } + + health->recovered_break_msg = NULL; + debugfs_create_file("break_health", 0200, health->ddir, health, + &nsim_dev_health_break_fops); + health->binary_len = 16; + debugfs_create_u32("binary_len", 0600, health->ddir, + &health->binary_len); + health->fail_recover = false; + debugfs_create_bool("fail_recover", 0600, health->ddir, + &health->fail_recover); + return 0; + +err_dummy_reporter_destroy: + devl_health_reporter_destroy(health->dummy_reporter); +err_empty_reporter_destroy: + devl_health_reporter_destroy(health->empty_reporter); + return err; +} + +void nsim_dev_health_exit(struct nsim_dev *nsim_dev) +{ + struct nsim_dev_health *health = &nsim_dev->health; + + debugfs_remove_recursive(health->ddir); + kfree(health->recovered_break_msg); + devl_health_reporter_destroy(health->dummy_reporter); + devl_health_reporter_destroy(health->empty_reporter); +} |